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Patent US2603650A successfully refreshed from Google Patents.
US2603650A
Expired / Lapsed
US
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Preparation of heterocyclic compounds
Assignee: Universal Oil Products Co
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Filing: 1947-07-25
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Granted: 1952-07-15
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Expires: 1967-07-25
Abstract
No abstract record available.
Inventors
- 👤 Schmerling Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:25
CPC Classifications
C; C07; C07D; C07D309/00; C07D309/02; C07D309/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS FOR PRODUCING A HETEROCYCLIC COMPOUND CONTAINING A QUATERNARY CARBON ATOM WHICH COMPRISES REACTING A 1,5-DIHALO-3,3-DIALKYLPENTANE WITH A BINARY COMPOUND OF A METAL AND OF A NON-METAL OF GROUP VI OF THE PERIODIC TABLE AT A TEMPERATURE OF FROM ABOUT 150* C. TO ABOUT 300* C. AND IN THE PRESENCE OF A SUSPENDING MEDIUM FOR SAID BINARY COMPOUND CONSISTING ESSENTIALLY OF WATER.
Claim 2
Dependent Claim
63 words
A PROCESS FOR PRODUCING A HETEROCYCLIC COMPOUND CONTAINING A QUATERNARY CARBON ATOM WHICH COMPRISES REACTING A 1,5-DIHALO-3,3-DIALKYLPENTANE WITH A BINARY COMPOUND OF A METAL AND OF A NON-METAL OF GROUP VI OF THE PERIODIC TABLE AT A TEMPERATURE OF FROM ABOUT 150* C. TO ABOUT 300* C. AND IN THE PRESENCE OF A SUSPENDING MEDIUM FOR SAID BINARY COMPOUND CONSISTING ESSENTIALLY OF WATER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-15 | 1956-01-14 | 1956-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-15 | 1960-01-14 | 1960-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-15 | 1964-01-14 | 1964-07-15 | $7700.00 | Window Closed / Lapsed |